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United States › Oregon › Grant County › Climate Station JOHN DAY, OR US Distance 5.7 mi Normals 1991–2020

30-year climate normals

Grant County Climate and Weather Averages

Hottest month — July

86.2°

average daily high. The coldest month is December, averaging a low of 20.8°F.

Grant County gets 12.27" of precipitation a year and 9.6" of snow, and 38% of it falls in Apr, May, Jun.

Temperature through the year

Each bar spans the average daily low to the average daily high for that month.

40° 60° 80° JanFebMarAprMayJunJulAugSepOctNovDec
MonthAvg highAvg low PrecipSnow
January 40.3° 21.2° 1.09" 3.5"
February 44.8° 22.6° 0.60" 1.4"
March 51.5° 26.4° 1.14" 1.2"
April 57.3° 30.3° 1.49" 0.3"
May 66.4° 37.1° 1.83" 0.0"
June 74.5° 42.7° 1.30" 0.0"
July 86.2° 47.8° 0.43" 0.0"
August 85.8° 46.1° 0.50" 0.0"
September 76.7° 39.1° 0.52" 0.0"
October 62.2° 31.1° 1.04" 0.2"
November 47.5° 25.6° 1.19" 1.0"
December 39.0° 20.8° 1.14" 2.0"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 38% falling in the wettest three months (Apr, May, Jun).

January 1.09"
February 0.60"
March 1.14"
April 1.49"
May 1.83"
June 1.30"
July 0.43"
August 0.50"
September 0.52"
October 1.04"
November 1.19"
December 1.14"
Annual total 12.27"

What this climate costs you

Degree days measure how hard a building has to work to stay comfortable. They are the reason two identical houses have very different power bills, and they are the link between the weather here and what you pay every month.

Cooling degree days How much air conditioning the climate demands 249
Heating degree days How much heating the climate demands 6,866
Approximate annual cooling cost At 16.27¢/kWh, Oregon average $41
Approximate annual electric heating cost Lower where heating is gas rather than electric $391

These are rough planning figures from degree days and the state electricity price, not a bill estimate. House size, insulation and fuel type move them a lot. See the full cost of owning a home in Grant County, where electricity is one line of eight.

Common questions

What is the weather like in Grant County?

Grant County averages a high of 86.2°F in July and a low of 20.8°F in December. Annual precipitation is 12.27 inches, including 9.6 inches of snow.

When is the rainy season in Grant County?

The wettest stretch is Apr, May, Jun, which accounts for 38% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Grant County?

The average daily high in July, the hottest month, is 86.2°F. That drives 249 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Grant County?

Yes. Grant County averages 9.6 inches of snow a year.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station JOHN DAY, OR US (USC00354291), 5.7 miles from the county centroid.
  • Heating and cooling degree days — NOAA, same station and period.
  • Electricity price — US Energy Information Administration, Electric Power Monthly Table 5.6.A, Oregon residential average.
  • Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.